Are you using any extra C connected to the rear terminals of the tuner?
Likely needed if the high Z switch is in #5 position. The extra C is 1000
pf @ 500 V as provided by Tentec.
I use 256 ft of wire {natural resonance measured to be 1.85 MHz}, center fed
with 450 ohm window line, about 65 ft, connected direct to the center feed
point of the antenna and direct to the 1:1 W2FMY current balun at the
operating position. The balun is connected to the Tentec 238 tuner via
about 1 ft of RG-213. To get to the low end of 160M I do have to connect
the extra C to the rear terminal of the tuner.
This arrangement will work all bands, all frequencies 160M - 10M, attaining
a 1.5:1 match or better. Center of the antenna is at 50 ft configured as an
inverted V with the ends about 25 ft above the ground.
73
Bob, K4TAX
----- Original Message -----
From: "Mike Bryce" <prosolar@sssnet.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Friday, October 11, 2013 11:36 PM
Subject: [TenTec] Antenna is up, but the coupler doesn't like 160 meters
Okay boys and girls.
the antenna project is done
I have a 160 meter doublet feed with 600 ohm line. 130ish feet on each
side.
Followed the antenna suggestions from everyone and now have it connected
to a 1:1 balun with a one foot hunk of coax to the Ten Tec 239 coupler.
Everything works fine------ except for 160 meter
I can't find a tuning solution for any freq on that band below 1.995 mhz.
Shortening the antenna feedline is not possible, it has to reach the
coupler.
I don't like the idea of adding more length to the feedline, but looks
like I may have to.
How much?
What about lengthening the wire on the ends of the antenna?
Make it shorter, (the overall length of the antenna)
The 239 can find a solution on 1.995 (SWR 2:1) but the selector shows the
best match on the high Z side
okay, it's been too quiet here, so this should heat things up
Mike, WB8VGE
SunLight Energy Systems
The Heathkit Shop
http://www.theheathkitshop.com/
J e e p
o|||||||o
A man with one clock knows what time it is. A man with two clocks is never
sure.
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